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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4b76eff8ad4cfc789e2edc32d03a17eb2ca4855a3e48e0aecc6107ef97567e' 
  AND token = 'M3MLpoI/rIGL8mHMobvVobkF+q7h+pWOGxMgHcL96qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}